Which of the following is used to ensure users have the appropriate level of access to perform their job functions?

An Access Control List (ACL) is a set of rules that define what permissions a user or group has to a particular resource, which is a mechanism used to enforce least privilege, not the principle itself.

Multifactor authentication (MFA) adds an extra layer of security to the authentication process by requiring multiple verification methods, but it does not determine what level of access a user has after successful login.

The principle of least privilege is a fundamental security concept that dictates that users, programs, and processes should be granted only the minimum necessary permissions or access rights required to perform their authorized functions. This minimizes the potential damage from a security breach or error, as an attacker or compromised account would have limited scope.

Mobile Device Management (MDM) is a solution for securing and managing mobile devices, which helps enforce security policies but doesn't directly define the appropriate level of access for job functions.